Radius and angle dresser



Jan. 22, V1952 A.--T. GIGLIA RADIUS AND ANGLE DRESSER 2 SHEETS- Filed May l5, 1948 Ri .Sw

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llllll A. T. GIGLIA RADIUS AND ANGLE DRBSSER Jan. 22, 1952 2 4 SHEETS-SHEET I2 Filed May l5, 1948 mw A l' INVENTOR.`

@www Patented Jan. 22, 1952 UNITED STATES PATENT OFFICE 2,583,480 RADIUS AND ANGLE DRESSER Aifons peigne, BronN. Y. imputation May 15, 194s, serial No. 27,335

' voiaims.' (o1. 12s- 11) This. invention relates to a tool for dressing or shaping a grindstone to a predetermined radius or angle, it being customary to xedly mount such a. toolon the bedor magnetic chuck of a surface grinder which is `provided with means for rotatively holding thestone to be dressed. This invention may also be used on any other machine which requires dressing of the grindstone. The stone will, when` properly dressed or shaped, be used to sharpen precision tools or shape any metal or other material having a Working surface corresponding to the angle or radius cut on the stone through use of my invention.

The objectof my invention is to provide a tool of this type which is capable of unusually accurate and ne adjustments whereby Work requiring the utmost precision maybe greatly expedited with the accuracy thereof being assured.

Another object of my invention lis to provide a tool of the character described whereby the precise angle desired to be cut into the' stone may be set on the tool and the tool locked at thedesired angle but capableof beingmoved across the surface toV be dressed'.

Another object of my invention is to provide a tool of this type on which the exact radius desired to be out on the stone may be set and the tool locked on` this setting but capable of being swung rotatively on the surface tobe dressed.

Another object of my invention is `to provide a tool of this character with a relatively hard mafterial'such as a diamond or the like for dressing the stone or other material, the mounting of said diamond being capable of micrometer adjustment toward and away from the work being dressed with means for locking the mounting including the diamond in the desired position.

A further object is to provide a means for determining the amount of wear on the diamond, said means including a micrometer` guage and a Aremovable stopor guage for setting the cutting edge prior to being applied tothe Work.

A further Objectis to provide a tool of this type in which means for expelling the diamond in its mounting from its carrying head are locatedy inthe interior of the said head.

A further object is tofurnish a tool of this type which includes a base therefor on which` is ro# tatably mounted an element shaped to t precisely over the top of said base and capable of being `swung or turned. with. practically no lost motion.

A further object is to provide a tool of thistype which` istso constructed and accurate as to be practically devoiduof lostmotion either during addustmentor'operatiom M 2 Referring toutheaccompanying drawings: n Fig. 1` represents a plan view of my new radius and angle cutting device.

Fig. 2 represents one end elevation of the same. Fig. 3 `represents a side elevation of the same with a portion of the base broken away to show.

partswithin.- y M Fig. 4- represents an end elevation opposite of that shown in Fig.. 2. p I

Fig. 5 represents a detailside elevation. of the micrometer head, and' a meansof holdingsame on the body.

Fig. 6 represents `an inverted plan view of the same, including the adjustable cutting device or dressing element;

Fig. "7. representsa detail plan view ofthe portion of the verticalsupportto which the micrometer head is aixed.

Fig. 8 represents a vertical sectiontaken in the plane of the line VIII-VIII` of` Fig. 'l looking in the direction of the arrows.

Fig; 9 represents a side view of the tapered screw means for locking the cutting device` to the" body.`

Fig.` lrepresents a vertical section through the head and cutting device taken in the plane of the line X-X of Fig. 6 looking in the direction of the arrows.

Fig. 11 representsa plan. view of aigauge for obtaining the initial setting of `the cutting edge of the dressing element when affixed to the body as shown in Figs. l. 3 and 4.

Fig. 12 represents the means of securing the guageto the body.

Fig. 13 represents: a planview of the device with the` parts in` position to `dress the stone to a cone cave surface.

Fig. 14 represents a similar view with the parts in positionrto dressa stone toaconvex surface.

Fig. 15 represents` asimilar view with theparts in still anotherposition to dress a stone to a desired angle.

Fig. 16 represents a horizontal sectionthrough thevertical support showing the body adjusted on its base in a different position from that shown in the preceding figs.

Fig. 17` represents a side elevation of thelsame, and i Fig. `18 represents a vertical section takenon the plane of` the line XVIII- XVIII of Fig. 16 looking` in the direction of the arrows;

Referring especially toFigs. 17, 3, 2i, 16 and 10, the tool rests upon Aa substantially rectangular base I which is adapted to be held in place.` on the chuck of `a surfacegrinder E, `the said chuck being preferably ofu `the magnetic type.

assenso ase I is centrally bored at 2 to receive a screw 3 for purposes described below. Base is also bored and tapped to receive screws 4, which serve to secure a circular element 6 thereto, it being understood that as many screws as desirable, ordinarily four, may be used. The element 6 is provided with a central bore 1 alined with but of less diameter than bore 2 in base I. Said element is cut back horizontally throughout its circumference to form a flat surface 8, the inner horizontal surface of which is grooved at 9, said groove being annular and of varying depth in one direction and of constant depth in the opposite direction starting from the groove center.V The vertical surface of the upper part of element 6 is provided'near the top with an annular groove I0 adapted to receive the tapered end of set screw I carried in the wall of another rotatable circular element I2. Said element I2 is centrally bored, the bore I3 being on the same vertical axis as but of slightly less diameter than bore 1.

vRotatable element I2 isA centrally recessed at I4 to precisely fit the upper part of element 6, the depending outer portion of said first named element being vmachined to fit the vertical wall ofthe said upper part of element 6 as well as Vtaining the head 3| in its desired position and enable same to resist forces which might tend to the fiat surface 8 thereof. When the above contacting surfaces are properly oiled or lubricated before assembly, no air is permitted to remain therebetween and a sliding fit is accomplished in which lost motion is negligible.

The outer circumference of element I2 is furnished with a suitable scale I5, the zero point of which is matched with the scribe mark I6 on the outer circumference of element 6. Rigidly secured to the top of element I2 is an oblong rectangular block I1, tapped centrally at I8 to receive the end of screw 3 whereby the parts I, 6, |2 and I1 are held together. The desired movement of l2 on 6 is made possible by fitting the flanged sleeve I9 into bores 2 and 1 and a secondV anged sleeve 28 above |9 into bores 1 and I3. It will be noted that sleeve 20 extends slightly into a chamfered groove in the bottom of'block I1 so that said block is so positioned as to match up the zero point and scribe mark mentioned above when properly assembled. Also a washer spaces screw head 3 from the flange of sleeve |9.

Block v|1 is under-cut longitudinally on its top surface equi-distant each side of the center and at an angle of .approximately 45 from the horizontal to form a tongue 2| adapted vto fit undercut 22 in a vertical support 23 which is slidably mounted on said tongue 2| by fitting it over said tongue from one side and clampingto it by means of screws 24, 25, a piece 26Y shaped to flt'pne side of said tongue 2| and support 23. The undercut portion of block I1 is bored at equally spaced intervals longitudinally to receive the end of set screw 21 supported in piece 26 in a suitable tapped horizontal hole.v

Tongue 2'| (see Fig. 18) is provided with a cut out portion 28` which permits the longitudinal travelther'ein throughout its length of Vthe head of a screw 29 carried by the bottom of vertical support"23',the` walls o'f said cut out: acting as limit stops for the movement of support 23. Block-|1 is also suitably marked on its outer surface to coact'with ascribe mark on piece 26, the said zero points being alined when the support is in its middle position, i. e.v with equal adjustment/available in opposite directions.

The top portion of support 23 (see Fig. 7) is vertically bored'toreceive `the locking andalindisplace it.

Support 23 is tapped to receive set screw 3S, which is tapered so that there is a difference of approximately .003 between the middle portion thereof and the end received in bore 31 of support 23. This taper permits the screw to pass through the alined holes 38, 39 which are bored at right angles to the vertical axis of shaft 3D and madeV slightly elliptical in shape and enter bore 31. Setting up on screw 36 forces it against the upper surface of hole 38 and bore 31 whereby due to the taper Vabove described the shaft 30 is pulled downwardly, the grooves 34, 35 firmly seated over the projecting corners formed by the grooves 32, 33 and the micrometer head 3| is locked to support 23 (see Figs. 3, 56, 1, 8 and 9). It should also be noted that holes 40, 4I are bored at right angles to holes 38, 39 to which they correspond in shape andlocation, i. e. all on the same horizontal axis, so head 3| may be locked at right angles to the position first described. The micrometer head 3| (see Figl), in addition to the features previously -mentioned, includes a hollow cylindrical portion 42', the bottom of which has the grooves-34, 35. Fitted into this cylinder at one end is a flanged sleeve 43 secured thereto lby suitable means such as screws 44, 45, 46, countersunk in the flange. The bottom of this flange is tapped vertically l to receive a screw 41, theY inner end of which engages a key l48a abutting the outer circumference of a diamond mounting holder 48 to secure same against longitudinal displacement, and to properly aline same.

This holder 48 is held in any well known or approved manner. Mounting 49 is held in 48 by screw 52 and is provided with an internally threaded recess 5I adapted to receive the-screw 52as will be described. Holder 48 is threaded externally at .its larger end into a flanged sleeve 53 having the inner surface of the flange threaded. This sleeve 53 is secured in place by screwl 54 threaded into the underside of cylindrical portion 42, and anI annular shoulder abutting 42 holds sleeve 53 against rearward movement when turned as described below.

Screw52 has its head slightly spaced from a hardfmetal washer or bushing 55 abutting against the inner end of the smallerend ofsleeve 53; AAn end piece 56 ts over said smaller end V,of sleeve and abuts cylinder 42, both 56 and'42 being provided with'cooperating indicia vreading inthousandthsof an inch.- End piece 56 is nor. mally freely rotatable unless .locked against cylinder 42 and sleeve 53 by means of a screw 51 passed through the'bore in said piece 56 and received in the internal threads of the small end of sleeve 53.-v j

'The said end of sleeve 53 almost abuts theface of 'screw head 51 which just outside the diameter of said end is providedwith a .slight annular `'narily contactLthe outer end surface off'i'53fis bvelled off atan angle of approXimately45l "A small round metallic split ring"58` is"plaoed in this cut out and when 'the screw 51is`s`et'upthe Hring becomes4 jammed againstV the" '45"su`1'faces 'of' ss tnerebyiockingsr to `5t 'andisaeand enabling thenito be Ltlirled therewith. e

The above mentioned constructionvenables lthe diamond mcuntmg "and ccnsequenuy the' diamonc to be Aincr/edj 1traguardimuye tcwardjaird away ffm the gauge 559 which is secured mplace "for" this purpose" by meansoi scre'wll received inpfsppcrt ze..` .e I e The diamond "mounting, including'i'thei dia- -merid so, may be removed 'byunjscrwmg eran-d inserting "an einenA wrench 'into the" recessed "head orscrevv s2.` As thisiscifejwisjbackes out, the head thereof abats wasnerisandthetoacvtili of the VScrew"With"the internal thread 'Of 'diamond mburiti'ngta jackssaidmunting out so that it may' beremove'd andreplaced'when necessary due towear'ordamage or to change 'to a smaller or larger diamond. The operation of myd'evice i's'was "follows:

LThe g'rindstneZ shown in dotted outline in Figs. 13 to 15 inclusive to Vbe dressed (the work to be developed `into a predetermined peripheral `contour) is mounted'ona rota-table `shaft in the usual manner and the tool ispl'aced inoperative position on the `magnetic "chuckof a surface grinder. To dress the stone to the desired radius, rst screw gauge* 5.9in place on'supp'ort H23 and turn screw 51until the point of `diarncmi 5D 'just touches gauge'il. Hold end piece 5E and i means of which the'support 23"`c'arryin`g head 3| may he movedin Vg" stepstowa'rd or away from the stone to be dressed. `Thedirection of motion of said support 23 `is determined according to the type of curve'desired e.; either concave or convex. If the former," `the head is moved forward'of the centre of rotation" of the element l2, ifjbonvex, rearwardly of `the center. "t'will be vunderstood that the "longitudinal aitisifof the micrometer head is set perpendicular to a chord of the circle on which the curve is being cut and its horizontal center line corresponds with the center of the stone. When the desired adjustments have been made, tighten the set screw 4'! and loosen the radius bearing set screw l I The tool is then ready to dress the stone to the desired radius.

When it is desired to dress the stone to a predetermined angle, the zero setting of the dia-- mond is determined as above described. Gauge 59 is then removed and radius bearing set screw Il is loosened. When the predetermined degree of angle has been set as noted on scale l5 as read from scribe mark I6 on the outer circumference of element 6, radius bearing set screw I l is tightened to lock the tool on this setting. As the longitudinal axis of the tool should be perpendicular to the surface to be dressed, it may be necessary to remove screw 36 so that the head 3| can be raised and turned 90 in the direction UJI assuitablefandin bore `3l. Anglebearing "set screw 21 is backed out and the tool is ready to dress the stone to the "required angle with the "backward and forward movement off'23.

It'willbe seen from the 'above that I have provided a tool of this character in whenversa'- tility of 'adjustment `is accomplished-asidesired 'and 'whereby "accuracy iSinsured by the positive llocliing'and lack of lost motion `in theseyeral elements.

"While it is evident 'that various"changes-maybe iriade in theconstrction, form andfarrangem'ent of the several parts without departing frmth'e e'spirit and scope ofmy Virwention*as particularly shown and 'described herein,` I do 4notint'end" `to be limited thereto lexceptas set forthL inithle following claims.

What I claim is:

V' l. A tool comprising a base,` a circularel'emeht affixed 'thereon' having horizontal 'and vertical surfacesa `second circular 'element rotatably 'mounted on said `first named element, ablock "mounted on `said rotatableelement,fmeans""re fleas'ably connecting the elements and" block' A"to the base and"to' "one "another, ayertical vsuppcrt mounted "cn said block; ami'crometer headcarried "byV "saidA vertical support and a dressing element, mounted' in 4said head, "the circular rotatable element'beingprovided with depending portions, the circular 'element on 'the base being provided 'with annularfgrooves on its'upper` hori- "zontal and vertical surfaces'ftheigroove "onits said horizontal surface being of'varying'depth in one direction and of constant'deptl inthe opposite direction starting `from the groove center, said depending portion and said horizontal and "vertica`1 lsurfaces being in substantially airtight Contact.

` 2. A tool comprising a dressing point, a supporting micrometer head carrying said ele-ment, a slidab'le support carrying said head, said 'mounting being removably carried in said head,

"means releasably locking thehead to "the slidable support, and other means alining the head, on the support, said last named means comprising right angled tongue and groove connections on `the head bottom and slidable support top for fing said supporting element, a circularfplatorm supporting said rotatable element, a base supporting said platform and means xing said platform to said base.

3. A tool comprising a base, a dressing point, its mounting, a supporting head carrying said mounting, a composite vertical support carrying said head, a supporting element for said vertical support, and means for releasably locking the head to said vertical support, said means including a shaft depending from the head, intersecting holes in said shaft, a horizontal bore in said support. and a vertical bore in said support, a tapered screw tapped in said support and adapted for cooperation with the said shaft holes and horizontal bore, a unitary rotatable element carrying said supporting element, a circular platform supporting said rotatable element and means fixing said platform to said base.

4. A tool comprising a base, a dressing point, its mounting, a micrometer head, said mounting being removably carried in said head, a composite vertical support carrying said head, a

, lower surface and supporting element respectively, a unitary rotatable element carrying said supporting element, fa circular platform supporting said rotatable element, said platform being iixed to said base, and means positively ensuring the assembly of the rotatable element and platform in a p-redetermined relationship, said last named means comprising a plurality of interconnected elements including sleeves, a plurality of bores holding said sleeves and a transverse groove in the bottom of the supporting element, adapted to receive the top sleeve end therein.

5. A tool comprising a base, a dressing point, its mounting, a micrometer head, said mounting being removably carried in said head, a composite vertical support for and connected to said micrometer head, a supporting element carrying said vertical support, grooved upper and undercut lower surfaces on the vertical support coacting with the head lower surface and supporting element respectively, a unitary rotatable element carrying said supporting element, horizontal and vertical inner surfaces on said rotatable element, a circular platform supporting said rotatable element, said platform being viixed to said base, said platform being shaped to and contacting substantially the entire inner surfaces both horizontal and vertical of the rotatable element to substantially eliminate lost motion therebetween.

6. A tool comprising a base, a dressing point, its mounting, a micrometer head, said mounting being removably carried in said head, a composite vertical support carrying said head, a supporting element carrying said vertical support, grooved upper and undercut lower surfaces on the vertical supporting element coacting with the head lower surface and supporting element respectively, a unitary rotatable element carrying said supporting element, said rotatable element being provided with a depending circumerential ange, a circular platform supporting said rotatable element, said platform being aiiixed to said base and contacting substantially the entire bottom and inner flange surfaces of the rotatable element to substantially eliminate lost motion therebetween.

7. A tool comprising a dressing point and composite means vsupporting said point, said means including a micrometer head comprising a hollow cylindrical portion, a flanged sleeve secured therein, a tap in the sleeve bottonii a dressing point mounting, a holder for ,saidV mounting, means threaded in said tap and engaging theY outer circumference of said holder and securing same against longitudinal displacement, an internally threaded recess in said mounting, screw means fitted therein, a second anged sleeve threaded onto said holder, means threaded into said cylindrical portion and securing said second anged sleeve therein, means surrounding said mounting and holding said dressingV point against longitudinal rearward displacement, an annular ring spaced from said last named means and abutting said second flanged sleeve, an end piece abutting said cylindrical portion and fitted over the smaller end of said second flanged sleeve, cooperating indicia on said cylindrical portion and said end piece,"

an adjusting element, and means for locking said end piece to said last named element, said last named means comprising a bevel on the outer end of said end piece, a split ring located to be set against said bevel and an element so moving the ring whereby the said end piece and last named element are locked together.

ALFONSE T. GIGLIA.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 159,115 Parker Jan. 26, 1875 829,976 Lindgren Sept. 4, 1906 Y 1,250,359 Sacrey Dec. 18, 1917 1,332,398 Hoagland Mar. 2, 1920 1,368,499 Hardy Feb. 15, 1921 1,384,726 Duplessie July 12, 1921 1,387,427 Miller Aug. 9, 1921 1,563,900 Gardner et al. Dec. 1, 1925 1,880,234 Bullock et al. Oct. 4, 1932 1,938,769 Strom Dec. l2, 1933 1,992,768 Pioch Feb. 26, 1935 1,994,386 Dardani Mar. l2, 1935 2,118,902 Spicacci May 31, 1938 2,309,924 Root Feb. 2, 1943 2,366,623 Jakobsen Jan. 2, 1945 2,414,182 Wessman Jan. 14, 1947 2,442,453 Bley June 1, 1948 FOREIGN PATENTS Number Country Date 485,939 Germany Nov. 18, 1929 550,415 Great Britain Jan. 7, 1943 

